KR20020086142A - Turbo fan and manufacturing process thereof - Google Patents

Abstract

PURPOSE: An integrated type turbo fan and method for manufacturing the same is provided to reduce manufacturing cost by reducing the number of molds, while improving productivity by reducing manufacturing processes. CONSTITUTION: An integrated type turbo fan comprises a hub disk(110) including a boss section(111) coupled to a shaft of a motor and a hub section(112) extended radially from the boss section; a plurality of blades(120) having ends radially connected to the hub disk; and a shroud(130) connected, with a predetermined curvature, to the other ends of blades. The hub disk has an outer diameter smaller than the inner diameter of the shroud, and blades have ends contacting the shroud and which are formed integrally with the shroud. A virtual line connecting inner ends of each blade has a diameter almost same with the outer diameter of the hub disk.

Description

Integrated turbofan and its manufacturing method {TURBO FAN AND MANUFACTURING PROCESS THEREOF}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an integrated turbofan and a method for manufacturing the same, and more particularly, to an integrated turbofan and a method for manufacturing the same, in which a turbofan having a hub, a blade, and a shroud is molded into one mold to improve productivity.

In general, a turbofan is a type of centrifugal fan that pressurizes gas by using centrifugal force of a gas generated by the rotation of a van. Such a turbofan is mainly used for a large-capacity air conditioner because it generates a large amount of air. have.

As shown in FIGS. 1 to 3, the conventional turbo fan has a fan body 10 coupled to a rotating shaft of a driving motor (not shown) to suck and discharge fluid during rotation, and a fan body 10. Is coupled to the front end is composed of a shroud (shroud) 20 to prevent the fan body 10 from vibrating when the fan rotates and to guide the fluid flow smoothly.

The fan body 10 includes a hub plate 11 coupled to a rotating shaft of a drive motor (not shown), and blades 12 integrally molded at a predetermined angle on the front surface of the hub plate 11.

The hub plate 11 includes a boss portion 11a coupled to a rotating shaft of a drive motor (not shown), and a hub portion 11b extending radially from the boss portion 11a.

The blade 12 is integrally formed such that one end thereof protrudes from the front edge of the hub plate, and a coupling edge portion 12a having a predetermined inclination angle to be coupled to the inner circumferential surface of the fixed part side of the shroud 20 in a post-assembly at the front end thereof. Is formed.

The shroud 20 is formed of a truncated cone-shaped annular body in front projection, and a large diameter portion is formed at the rear side fixed to contact with the coupling edge portion 12a of the shroud 12, and the diameter gradually increases on the front side opposite to the large diameter portion. The smaller diameter part which becomes smaller gradually is formed.

The process of manufacturing the conventional turbofan configured as described above is as follows.

That is, the fan body 10 and the shroud 20 are separately manufactured to be assembled to each other. First, a cavity (not shown) having the same shape as the fan body 10 is formed in a fan body mold (not shown). Then, a flux such as PVC is injected into the cavity to integrally mold the hub plate 11 and the blade 12.

Next, a cavity (not shown) having the same shape as the shroud 20 is formed in the mold for the shroud (not shown), and the shroud 20 is manufactured by injecting a flux such as FBish into the shroud cavity. do.

In this way, by attaching the inner peripheral surface of the large diameter portion side of the shroud 20 to the engaging edge portion 12a of the blade 12 provided at the front edge of the fan body 10 by heat fusion or the like, the turbo Was to complete the fan.

However, in the conventional turbofan as described above, the fan body 10 and the shroud 20 are separately manufactured and manufactured by post-assembly, which pre-assembles the fan body 10 and the shroud 20 in different molds. Since it must be assembled separately and then assembled through post-processing such as heat fusion, the mold itself and mold work time required for the manufacture of the turbo fan are excessively consumed, and the assembling worker for combining the fan body 10 and the shroud 20. There was a problem that the number is reduced, the productivity.

The present invention has been made in view of the problems of the conventional turbofan as described above, and can reduce the number of assembly work by reducing the number of assembling work by molding the fan body and shroud collectively to improve productivity. It is an object of the present invention to provide an integrated turbofan and a method of manufacturing the same.

1 and 2 are a perspective view and a longitudinal sectional view showing an example of a conventional turbofan.

Figure 3 is a perspective view showing the assembly process of the conventional turbofan.

4 and 5 are a perspective view and a longitudinal sectional view showing an example of the turbofan of the present invention.

6 is a front view showing an example of the turbofan of the present invention from the rear side;

Figure 7 is a longitudinal sectional view schematically showing a mold for manufacturing a turbofan of the present invention.

8 is a perspective view showing a modification of the present invention the turbofan.

** Description of symbols for the main parts of the drawing **

110,210: hub plate 111: boss

112: hub 120,220: blade

121: coupling edge 130,230: shroud

M1: Lower type M2: Upper type

m1: cavity for hub plate m2: cavity for blade

In order to achieve the object of the present invention, a hub plate consisting of a boss portion coupled to the shaft of the motor and a hub portion radially extending from the boss portion, and one end thereof is connected to the hub plate at regular intervals in the circumferential direction. A blade and a shroud connected to the other end of the blades with a constant curvature,

The outer diameter of the hub plate is smaller than the inner diameter of the shroud, and the other end of the blades in contact with the shroud is provided with an integrated turbofan, characterized in that integrally molded with the shroud.

In the manufacturing method of the integrated turbofan by connecting one end of the blades to the hub plate coupled to the rotating shaft of the drive motor, and the shroud inclined with respect to the axial direction to the other end of the blades,

The inner diameter of the shroud is greater than or equal to the inner diameter of the imaginary circle connecting the inner ends of the blades, the outer diameter of the hub plate is smaller than the inner diameter of the shroud, and the outer diameter of the hub plate connects the inner ends of the blades. Molded to be approximately equal to the inner diameter of the circle,

Provided is a method for manufacturing an integrated turbofan, characterized in that each of the above-mentioned blades are collectively molded together with the hub plate in either mold to prevent a parting line due to a release gradient on the outer surfaces of the respective blades. .

Hereinafter, the integrated turbofan according to the present invention will be described in detail based on the embodiment shown in the accompanying drawings.

4 and 5 are a perspective view and a longitudinal cross-sectional view showing an example of the turbofan of the present invention, Figure 6 is a front view showing an example of the turbofan of the present invention from the rear side.

As shown therein, the integrated turbofan according to the present invention has a hub plate 110 coupled to a rotating shaft of a drive motor (not shown) and protrudes at regular intervals along the circumferential direction on the front surface of the hub plate 110. The blades 120 are formed to be radially elongated during front projection, and the shrouds are integrally formed to have a constant curvature at the other end of the blades 120.

The hub plate 110 includes a boss portion 111 coupled to a rotation shaft of a drive motor (not shown), and a hub portion 112 extending radially from the boss portion 111 to form a circle.

Hub portion 112 is formed to be closer to the round shape so that the outer diameter is smaller than the inner diameter of the shroud 130, and substantially the same as the inner diameter of the imaginary line connecting the inner front end of each blade (120).

The blades 120 are formed in a shape in which each inner tip portion extends outwardly from the outer circumference of the hub portion 112.

In addition, the blades 120 are integrally formed by bending at the front edge of the hub portion 112 so as to pressurize the gas by generating centrifugal force or centripetal force while rotating together when the hub plate 110 rotates.

The cross-sectional shape of the blades 120 may be a general blade shape, but the upper / lower line is curved, and the distance of the upper / lower line is preferably formed in a crescent shape that gradually increases from both ends toward the center.

On the other hand, the shroud 130 is an annular body formed integrally with the other front end of the blades 120, the rear side contacting the engaging edge portion 121 provided on the other front end of the blades 120 is provided with a large diameter portion having a large diameter, A small diameter portion is formed in which the diameter gradually decreases toward the front side.

The process of manufacturing the present invention integrated turbofan as described above is as follows.

That is, the lower mold | type M1 and upper mold | type M2 which have a cavity of a predetermined shape are suitably matched, and a flux, such as a PVC, is injected into the cavity between the lower mold | type M1 and the upper mold | type M2 through an injection hole, After a certain period of time to allow the above-mentioned flux to cure, the lower mold (M1) and the upper mold (M2) is separated to remove the molding to complete the manufacture of the integral turbofan.

In this case, as shown in FIG. 7, the lower mold M1 includes a cavity m1 for forming the hub plate 110 of the turbofan and a cavity for forming the entirety of the blades 120 connected to the hub plate 110. m2) is provided, as the main surface of the cavity (m1) to be the hub plate 110 is formed on the same circumference as the inner leading end of the cavity (m2) to be each blade 120, the lower mold (M1) and the molding At the time of separation, the hub plate 110 of the turbofan, which is a molded product, does not overlap with each blade cavity m2 of the lower mold M1 in the axial direction, so that the lower mold M1 can be smoothly removed.

In addition, when the blades 120 are manufactured in a combination of the lower mold M1 and the upper mold M2, a parting line is formed on the main surfaces of the blades 120 due to the release gradient of the mold, which hinders the smooth flow of air and abnormal noise. However, in the present invention, the hub plate 110 and the blade 120 as a whole can be molded in one place in the lower mold (M1) that the above step is generated on the main surface of the blades 120 To prevent the fluid from flowing smoothly.

In this way, as compared to combining the shroud by post-assembly by separately molding the shroud on the fan body, as well as reducing the number of molds, productivity is improved.

On the other hand, when there is a modification of the integrated turbofan according to the present invention is as follows.

That is, in the above example, the outer diameter of the hub plate 110 and the diameter of the imaginary line connecting the inner ends of the respective blades 120 are formed to be almost the same, but in the present modification, the inner ends of the blades 220 are connected. The diameter of the imaginary line is formed to be larger than the outer diameter of the hub plate 210, but the hub plate 210 and the blades 220 of the hub plate 210 as shown in FIG. In the outer periphery to the inner leading end of each blade 220 is to shape the weight portion (210a).

The fat part 210a is preferably formed at the outer circumferential side of the hub plate 210 and the tip end side of each blade 220 at round or obtuse angles, respectively.

When the outer diameter of the hub plate 210 is larger than the diameter of the imaginary line connecting the inner tips of the respective blades 220, the hub plate 210, the blades 220, and the shroud 230 are collectively formed. At the same time, it is possible to minimize the leakage of intake air to the rear side.

In the integrated turbofan according to the present invention, the blades are formed on the front surface of the hub plate in the circumferential direction, and the shroud is integrally formed at the tip of the blades, but the outer diameter of the hub plate is smaller than the inner diameter of the shroud, and each blade is formed. By making the whole of the field and the hub plate in one mold collectively, the hub plate, blades and shroud can be molded in one mold, which reduces the production cost and reduces the production cost as the mold quantity is reduced. The productivity is improved as the post-assembly is omitted and assembly labor is reduced.

In addition, when the blades are molded, the entire blade can be molded by one mold, thereby preventing the generation of parting lines due to the release gradient, thereby ensuring smooth flow of air and generating abnormal noise. Can be removed.

Claims (6)

A hub plate having a boss coupled to the shaft of the motor and a hub extending radially from the boss, blades having one end connected to the hub at regular intervals in the circumferential direction, and the other ends of the blades. Consists of shrouds connected with constant curvature, And an outer diameter of the hub plate is smaller than an inner diameter of the shroud, and the other end of the blades in contact with the shroud is integrally formed with the shroud. The integrated turbofan according to claim 1, wherein the diameter of the imaginary line connecting the inner tips of the respective blades is approximately equal to the outer diameter of the hub plate. The integral turbofan of claim 1, wherein an outer diameter of the hub plate is smaller than an inner diameter of the shroud and larger than a diameter of an imaginary line connecting the inner ends of the respective blades. 4. The integrated turbofan as claimed in claim 3, wherein the hub plate is provided with a scavenging part from an outer circumference of the hub plate to an inner tip of each blade. The integrated turbofan according to claim 4, wherein the fat part is formed at a round or an obtuse angle on the outer circumferential side of the hub plate and the tip end side of each blade, respectively. In the manufacturing method of the integrated turbofan by connecting one end of the blades to the hub plate coupled to the rotating shaft of the drive motor, and the shroud inclined with respect to the axial direction to the other end of the blades, The inner diameter of the shroud is greater than or equal to the inner diameter of the imaginary circle connecting the inner ends of the respective blades, the outer diameter of the hub plate is smaller than the inner diameter of the shroud, and the outer diameter of the hub plate connects the inner ends of the blades. Molded to be approximately equal to the inner diameter of the circle, A method of manufacturing an integrated turbofan, characterized in that the batch forming each of the blades together with the hub plate in one of the molds to prevent a parting line due to the release gradient on the outer surface of the respective blades.